The correct option is B Law of thermodynamics
The flow of energy can be explained with the help of law of thermodynamics. First law of thermodynamics states that energy is neither created nor destroyed, but can be transferred from one component to another, or transformed from one state to another. Second law of thermodynamics states that every energy transformation involves degradation or disspation of energy from a concentrated to a dispersed form due to metabolic functions, so that only a small part of energy is stored in the biomass.